A talented developer at the XDA Developers Forum has found a way to access each and every language built into Android using the Google Now app. Meaning, using the modified Google Now apk file, one can use 'Google Now' in the language of their choice, provided that it is a part of Android Jelly Bean's built-in supported languages.

In order to use the modified version of this software, you need to gain root access to your phone and then replace the Google Now apk file in your system folder with the modified version, which can be found here (XDA).